| 摘要 |
PROBLEM TO BE SOLVED: To provide a VCR having a BS tuner which can save consumption power remarkably when operated, by decreasing the output voltage from a power source with a control signal when the drive voltage to a BS antenna is unnecessary. SOLUTION: A control signal transmission path 17 and an output variable voltage circuit 18 are installed. When a BS antenna drive voltage is used, a control signal of active-high is applied and a transistor TR1 is turned on. A resistor R3 is connected in parallel with a resistor R2, and the output voltage becomes Vout 1. When the BS antenna drive voltage is not used, the control voltage becomes zero, the transistor TR1 is turned off, and the connection of the resistor R3 is released, so that the output voltage becomes Vout 2. As a result, electric power of (Vout 1-Vout 2) * load current can be reduced. |
